143556-35-8

1,4-Benzenedisulfonic acid,2-[3-acetyl-4,5-dihydro-5-oxo-4-[4-[2',3',5',6'-tetrahydro-1-(3-sulfopropyl)spiro[3H-indole-3,4'-[4H]pyran]-2(1H)-ylidene]-2-butenylidene]-1H-pyrazol-1-yl]-, tripotassium salt